I put in a Cimmaron here a few years ago to replace a 40 year old Kohler which was an unfortunate green color. The Cimmaron has been very dependable, and we have never needed to plunge it. With that being said, I do wish that the water spot was larger and the bowl wash was a little better. It's hard to find everything one desires at the same price point.

Edited to add- my Cimmaron is a 2-piece, not the same model this thread is showing.

Sorry to say, but I have two of the Cimarrons installed in my house right now. Bought them because of the "Kohler" name and the good looks along with the 1-piece advantage. However, they are the worse flushing toilets I have ever had the misfortune of owning. They seem to plug up fairly regularly, and absolutely do not wash the bowl at all. Double flushing is a must most of the time. Great looking toilet but that is the only positive comment I have.

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What model are your Kohlers? I'm assuming they aren't the same model as the one listed in this thread?

I installed a Kohler Cimmaron about 2 years ago. Installation was straight foward. It is elongated but otherwise looks the same as the one in the pictures.
My complaints are that the tubular flush valve would twist around and leak because it was not seating. Shortening the chain was a major improvement, but not a cure.
It has clogged once in that time and the plunger did not seat well in the bottom of the bowl because of the shape, making it a hassel.